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首页> 外文期刊>Journal of Molecular Biology >Purified membrane-containing procapsids of bacteriophage PRD1 package the viral genome.
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Purified membrane-containing procapsids of bacteriophage PRD1 package the viral genome.

机译:纯化的含有膜的噬菌体PRD1的前壳体可包装病毒基因组。

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摘要

Icosahedral-tailed double-stranded DNA (dsDNA) bacteriophages and herpesviruses translocate viral DNA into a preformed procapsid in an ATP-driven reaction by a packaging complex that operates at a portal vertex. A similar packaging system operates in the tailless dsDNA phage PRD1 (Tectiviridae family), except that there is an internal membrane vesicle in the procapsid. The unit-length linear dsDNA genome with covalently linked 5'-terminal proteins enters the procapsid through a unique vertex. Two small integral membrane proteins, P20 and P22, provide a conduit for DNA translocation. The packaging machinery also contains the packaging ATPase P9 and the packaging efficiency factor P6. Here we describe a method used to obtain purified packaging-competent PRD1 procapsids. The optimized in vitro packaging system allowed efficient packaging of defined DNA substrates. We determined that the genome terminal protein P8 is necessary for packaging and provided an estimation of the packaging rate.
机译:二十面体尾部双链DNA(dsDNA)噬菌体和疱疹病毒通过在门户顶点处运行的包装复合体,将ATP驱动的反应中的病毒DNA转移到预先形成的衣壳中。无壳dsDNA噬菌体PRD1(Tectiviridae家族)也有类似的包装系统,除了在前壳中有一个内部膜囊泡。具有共价连接的5'-末端蛋白的单位长度线性dsDNA基因组通过唯一的顶点进入前壳体。两种小的完整膜蛋白P20和P22提供了DNA转运的通道。包装机械还包含包装ATPase P9和包装效率因子P6。在这里,我们描述了一种用于获得纯化的,具有包装能力的PRD1衣壳的方法。优化的体外包装系统可以有效包装确定的DNA底物。我们确定基因组末端蛋白P8对于包装是必需的,并提供了包装率的估算值。

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